Low-manganese thick Q355B steel plate and manufacturing method thereof

A technology of Q355B and manufacturing method, which is applied in the field of iron and steel metallurgy, can solve the problems of high production cost and high position, and achieve the effect of suppressing center segregation and improving low-fold quality

Pending Publication Date: 2022-07-22
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the Mn alloy content of 40.01-80mm Q355B steel plate was controlled above 1.40%. Affected by the international situation, the cost of various ores continued to rise, the price of Mn alloys continued to be high, and the production cost was relatively high.

Method used

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  • Low-manganese thick Q355B steel plate and manufacturing method thereof
  • Low-manganese thick Q355B steel plate and manufacturing method thereof
  • Low-manganese thick Q355B steel plate and manufacturing method thereof

Examples

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Embodiment Construction

[0025] The following examples may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0026] A process route of Q355B steel plate with low manganese thickness specification is: molten iron KR pre-desulfurization, converter smelting, LF refining, slab continuous casting, slab reheating, rough rolling-finishing rolling-steel plate rapid cooling-steel plate hot straightening-upper cooling bed Cooling-finishing-storage, the control parameters of the smelting heat and the mother plate rolling process in this embodiment are shown in Table 1, the melting components of the smelting heat are shown in Table 2, and the mechanical properties of the hot-rolled mother plate are shown in Table 3. Among them, the tensile impact performance test standard in Table 3. According to GB / T 228 and 229.

[0027] Table 1: Example smelting heats and master plate rolling process control parameters

[0028]

[0029] Tab...

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Abstract

The invention discloses a low-manganese thick Q355B steel plate and a manufacturing method thereof. Comprising the following components in percentage by weight: 0.19-0.22% of C, less than or equal to 0.24% of Si, less than or equal to 1.10% of Mn, 0.005-0.025% of Nb, 0.010-0.040% of Al, 0.010-0.040% of Ti, less than or equal to 0.10% of Cr, less than or equal to 0.025% of P, less than or equal to 0.008% of S, less than or equal to 0.008% of N and the balance of inevitable impurity elements. And the carbon equivalent Ceq [= C + Mn / 6 + (Cr + Mo + V) / 5 + (Cu + Ni) / 15] of the low-manganese thick Q355B steel plate is less than or equal to 0.45%. The yield strength of the steel plate is larger than or equal to 355 MPa, the tensile strength is larger than or equal to 470 MPa, the elongation (A) is larger than or equal to 21%, the Charpy impact energy at the normal temperature is larger than or equal to 54 J, and the flaw detection performance meets the II-level requirement in GB / T 2970.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a low-manganese-thick specification Q355B steel plate and a manufacturing method thereof. Background technique [0002] With the growth of infrastructure facilities in various countries, the demand for Q355B is increasing day by day, and it is currently the largest low-alloy structural steel produced. In the past, the Mn alloy content of 40.01-80mmQ355B steel plate was controlled at more than 1.40%. Affected by the international situation, the cost of various ores continued to rise, the price of Mn alloys continued to be high, and the production cost was relatively high. In addition, the RH process is still required for steel plates above 40mm. In fact, with the improvement of the smelting level, the cancellation of the RH process for some specifications can also meet the conventional flaw detection requirements. The decrease in the internal quality of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C33/04B21B1/46C21D8/02C21D11/00
CPCC22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C33/04B21B1/463C21D8/0205C21D8/0226C21D8/0247C21D11/005C21D2211/005C21D2211/009
Inventor 周子夜林涛铸赵辉李冉聂文金何明涛雒广杰
Owner SHAGANG GROUP
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